By 2020 IoT devices could exceed 20 billion, and by 2030 there could be more than 500 billion. Any failure in an IoT ecosystem exposes multiple devices, and security flaws typically revolve around three areas: authentication, connection, and transaction. By using blockchain to manage access to data from IoT devices any attacker would have to bypass an additional layer of security that is underpinned by some of the most robust encryption standards available.